Non-standard Coarse Gold Powder Rapid Wet Refining Method

Abstract

The invention relates to a method for quickly wet-process refining non-standard coarse gold powder. In the method, the quality of a product is guaranteed, the production cost is low, the product processing loss is low and the production period is short due to optimization of an oxidization-reduction potential. The method comprises the following steps of: 1) adding pure water and feeding the coarse gold powder into a reaction kettle, adding salt and H2SO4 sequentially, quickly raising the temperature to be 80 to 85 DEG C, starting to add NaClO3 serving as an oxidizing agent to make the potential reach 1,000 to 1,100 mv, keeping the potential reacting for 4.5 to 5.5 hours, raising the temperature to be 90 to 95 DEG C, keeping the temperature for 1.5 to 2.5 hours and filtering to obtain filtrate which is called gold separation solution; and 2) injecting the gold separation solution obtained by chloridizing and dissolving the coarse gold powder into the reaction kettle, raising the temperature to remove chlorine, adding oxalic acid to adjust the potential to be 880 to 920 mv, adding anhydrous sodium sulfite to make the potential reach 710 to 750 mv, filtering, and washing filter residues to be neutral by using distilled water.

Description

technical field [0001] The invention relates to a gold refining process. Background technique [0002] The process of a refinery consists of gold mud pretreatment process, impurity removal process, gold separation process, reduction process, silver replacement electrolysis, gold and silver melting and casting, sewage treatment process and other processes. The gold ingots produced are mainly IC99.995 and IC99.99 Two kinds of standard products, the quality standard of gold ingot The current standard of gold ingot product in China is GB / T 4134-2003. Due to the high impurity content in the raw material of gold cyanide mud and the unstable content of each impurity component (see Table 1), the quality of the coarse gold powder produced is unstable, that is, the impurity content does not meet the requirements of IC99.995 and IC99.99, but the impurity The content is not more than 5%, still needs to be refined. [0003] Table 1 Gold cyanide mud raw material impurity content [000...

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Problems solved by technology

Compared with the electrolysis process, this process has the advantages of fast production speed, no backlog of gold in the process, high direct recovery rate, and simple operation; but the process is not selective: some elements associated with gold are often co-extracted into the organic phase with gold , which reduces the selectivity of extraction; in addition, its complex with gold is very stable, and it may be difficult to extract from the organic phase; there are not many extraction and refining processes with industrial value, such as ether extraction and refining of high-purity gold, aqua regia dissolution-DBC extraction and refining method; the pollution caused by production is relatively large, the working environment is poor, and waste gas treatment is difficult; at the same time, according to the actual production situation, sometimes it is necessary to combine several processes for refining, such as chlorination-extraction-reduction-electrolysis, etc. The process is relatively complicated. large investment

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